Hi there MFriedma,
We understand you have a question about connecting an external monitor to your MacBook Air, and we'd like to share some resources that can help.
Get started here: MacBook Air (13-inch, 2017) - Technical Specifications
Specifically, the details below may help:
"Video Support
Simultaneously supports full native resolution on the built-in display and up to 3840-by-2160 resolution at 60Hz on an external display, both at millions of colors
- Thunderbolt digital video output
- Native Mini DisplayPort output
- VGA, HDMI, DVI, and dual-link DVI output using adapters (sold separately)"
You can learn more about Thunderbolt adapters here: About Apple Thunderbolt cables and adapters
Finally, take a look at this page for how to connect an external monitor: Use external monitors with your Mac
We hope this helps.